34 



HYDRO IDS AND JELLY-FISHES. 



which is the stomach ; but they have not the parti- 

 tions that in the Sea- Anemone and the Corals divide 

 the rest of the body into separate parts ; nor is the 

 stomach a sac hanging within the body, as in the Sea- 

 Anemone, but it is a cavity hollowed out of the sub- 



No. 23. 



stance of the body. If we look at the slender stalk 

 with a microscope, we shall find that, instead of a stalk, 

 it is a hollow tube, connecting with the central stem, 

 which is also hollow. In this community of animals, 

 as in the coral community, each one is connected with 

 the next by these stems, so that all the water and food 



